<template>
  <div class="swiper-container" ref="cur">
    <div class="swiper-wrapper">
      <div class="swiper-slide" v-for="(slide,index) in skuImageList " :key="slide.id">
        <img :src="slide.imgUrl" :class="{active:currentIndex==index}" @click="changeCurrentIndex(index)" >
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>

  import Swiper from 'swiper'
  export default {
    name: "ImageList",

    props:["skuImageList"],
    data(){
      return {
        currentIndex:0,
      }
    },
    watch:{
      //监听数据,可以保证数据ok,但不能保证v-for遍历完成
      skuImageList(newValue,oldValue){
        //利用vue一个方法
        this.$nextTick(() => { 
          let mySwiper = new Swiper(this.$refs.cur, {
                            // 如果需要前进后退按钮
                            navigation: {
                                nextEl: '.swiper-button-next',
                                prevEl: '.swiper-button-prev',
                            },
                            //一次显示几张图片
                            slidesPerView:3,
                            //每次切换图片个数
                            slidesPerGroup:1,

                        })
         })
      }
    },
    methods:{
      changeCurrentIndex(index){
        //修改响应式数据
        this.currentIndex = index
        //通知兄弟组件Zoom改变数据图片
        this.$bus.$emit('getIndex',this.currentIndex)
      }
    }
  }
</script>

<style lang="less" scoped>
  .swiper-container {
    height: 56px;
    width: 412px;
    box-sizing: border-box;
    padding: 0 12px;

    .swiper-slide {
      width: 56px;
      height: 56px;

      img {
        width: 100%;
        height: 100%;
        border: 1px solid #ccc;
        padding: 2px;
        width: 50px;
        height: 50px;
        display: block;

        &.active {
          border: 2px solid #f60;
          padding: 1px;
        }

        
      }
    }

    .swiper-button-next {
      left: auto;
      right: 0;
    }

    .swiper-button-prev {
      left: 0;
      right: auto;
    }

    .swiper-button-next,
    .swiper-button-prev {
      box-sizing: border-box;
      width: 12px;
      height: 56px;
      background: rgb(235, 235, 235);
      border: 1px solid rgb(204, 204, 204);
      top: 0;
      margin-top: 0;
      &::after {
        font-size: 12px;
      }
    }
  }
</style>